Synaptonemal complex analysis of hybrid cattle. III. Meiotic pairing mechanisms in F1 Brahman × Hereford hybrids

Genome ◽  
1991 ◽  
Vol 34 (2) ◽  
pp. 228-235 ◽  
Author(s):  
A. E. Dollin ◽  
J. D. Murray ◽  
C. B. Gillies
Keyword(s):  
Synaptonemal Complex ◽  
Chromosome Pairing ◽  
Complex Analysis ◽  
Bos Taurus ◽  
Bos Indicus ◽  
Meiotic Pairing ◽  
Homoeologous Chromosome ◽  
Homoeologous Chromosome Pairing ◽  
Synaptonemal Complex Analysis ◽  
Complex Hybrid

The mechanisms of homoeologous chromosome pairing were studied in synaptonemal complex (SC) spreads of F1 Brahman (Bos indicus) × Hereford (Bos taurus) cattle. The most common SC abnormalities were bivalents with partial pairing failure and interlocks. While C-band polymorphisms could underlie most of the SC abnormalities observed in the full-blood cattle, other causes seem also to be contributing in the hybrids. The pattern of the abnormalities indicates that genie differences between the species were probably involved. Pachytene substaging data suggest that in some spreads, early pachytene bivalents with partial pairing failure may achieve complete synapsis or may be converted to interlocks by late pachytene.Key words: synaptonemal complex, hybrid cattle, interlocks.

Synaptonemal complex analysis in primary spermatocytes of cattle x zebu hybrids (Bos taurus × Bos indicus)

1990 ◽  
Vol 107 (1-6) ◽  
pp. 229-238 ◽  
Author(s):  
M. Switonski ◽  
H. A. Ansari ◽  
A. Matthew ◽  
H. R. Jung ◽  
G. Stranzinger
Keyword(s):  
Synaptonemal Complex ◽  
Complex Analysis ◽  
Bos Taurus ◽  
Bos Indicus ◽  
Synaptonemal Complex Analysis

Synaptonemal complex analysis of hybrid cattle. I. Pachytene substaging and the normal full bloods

Genome ◽  
1989 ◽  
Vol 32 (5) ◽  
pp. 856-864 ◽  
Author(s):  
A. E. Dollin ◽  
J. D. Murray ◽  
C. B. Gillies
Keyword(s):  
Electron Microscopy ◽  
Synaptonemal Complex ◽  
Chromosome Pairing ◽  
Complex Analysis ◽  
Bos Taurus ◽  
Meiotic Chromosome ◽  
Early Pachytene ◽  
Meiotic Chromosome Pairing ◽  
Synaptonemal Complex Analysis

Meiotic chromosome pairing abnormalities in full-blood and hybrid Bos taurus and B. indicus cattle have been surveyed by electron microscopy of pachytene synaptonemal complex spreads. In this paper, the full-blood spreads are described in detail, including the use of XY and nucleolar morphology and other measured parameters for pachytene substaging. Pairing abnormalities were observed in up to 9% of the full-blood spreads. Most of these pairing abnormalities (83%) occurred in early-pachytene spreads, suggesting that the mechanism of synaptic adjustment may operate in cattle.Key words: synaptonemal complex, cattle, pachytene substages.

Synaptonemal complex analysis of hybrid cattle. II. Bos indicus × Bos taurus F1 and backcross hybrids

Genome ◽  
1991 ◽  
Vol 34 (2) ◽  
pp. 220-227 ◽  
Author(s):  
A. E. Dollin ◽  
J. D. Murray ◽  
C. B. Gillies
Keyword(s):  
Synaptonemal Complex ◽  
Complex Analysis ◽  
Bos Taurus ◽  
Meiotic Chromosome ◽  
Bos Indicus ◽  
Backcross Hybrid ◽  
Synaptonemal Complex Analysis ◽  
Backcross Hybrids ◽  
Fertility Problems ◽  
And Inversion

The levels of meiotic chromosome pairing abnormalities observed in six Australian F, Bos indicus x Bos taurus cattle crosses (mean = 23%) were significantly higher than those of the full-blood breeds (9%). The abnormal configurations in the F[hybrids included partial pairing failure, multivalents, interlocks, and inversion pairing. Abnormal configurations were also present, but at lower frequency, in backcross hybrid bulls. The main types of abnormal configurations and the levels of XY-autosomal associations and autosomal asynapsis observed were unlikely to cause significant fertility problems in the hybrids.Key words: synaptonemal complex, hybrid cattle, meiosis.

scholarly journals Synaptonemal complex analysis of Nellore and Gyr breeds of Bos taurus indicus

Caryologia ◽  
2000 ◽  
Vol 53 (2) ◽  
pp. 141-146 ◽  
Author(s):  
Marcia Denise Paixao Scavone ◽  
Claudio Oliveira ◽  
Luzia Aparecida Trinca ◽  
Fausto Foresti
Keyword(s):  
Synaptonemal Complex ◽  
Complex Analysis ◽  
Bos Taurus ◽  
Bos Taurus Indicus ◽  
Synaptonemal Complex Analysis

Assessment of chromosome associations in haploids and their parental accessions in Hordeum

Genome ◽  
1988 ◽  
Vol 30 (2) ◽  
pp. 204-210 ◽  
Author(s):  
R. von Bothmer ◽  
N. C. Subrahmanyam
Keyword(s):  
Genetic Variation ◽  
Chromosome Pairing ◽  
Diploid Species ◽  
Meiotic Behaviour ◽  
Meiotic Pairing ◽  
Homoeologous Pairing ◽  
Homoeologous Chromosome ◽  
Homologous Pairing ◽  
Homoeologous Chromosome Pairing ◽  
Chromosome Associations

Meiotic pairing was studied in the following species and their haploid derivatives: Hordeum cordobense 2x, H. marinum 2x and 4x, H. secalinum 4x, H. capense 4x, H. jubatum 4x, H. brachyantherum 4x and 6x, H. lechleri 6x, and H. procerum 6x. The study revealed (i) homologous pairing in diploid species and very little nonhomologous associations in their mono-haploids; (ii) the alloploid nature of the polyploid taxa; (iii) a certain degree of homoeologous pairing in polyhaploids despite the diploid-like meiotic behaviour of the polyploids; (iv) genetic variation in the suppression of homoeologous chromosome pairing in different Hordeum species.Key words: Hordeum, meiotic pairing, haploids.

Variation in induction of homoeologous chromosome pairing in 6x Aegilops crassa by genomes of six different species of Secale

1985 ◽  
Vol 27 (5) ◽  
pp. 531-537 ◽  
Author(s):  
P. K. Gupta ◽  
George Fedak
Keyword(s):  
Control System ◽  
Chromosome Pairing ◽  
Meiotic Pairing ◽  
Homoeologous Chromosome ◽  
Homoeologous Chromosome Pairing ◽  
Total Dna ◽  
Heterochromatin Content ◽  
Aegilops Crassa

Meiosis was studied in hybrids between Aegilops crassa (Boiss.) Hitch and Hensl. (2n = 6x = 42) having the genomes DD2MCr and six species of Secale. The chiasmata frequency per cell ranged from 6.86 in hybrids with S. cereale to 9.93 in hybrids with S. montanum ssp. dalmaticum. These results provide further evidence that a meiotic pairing control system is operating in Ae. crassa. The Secale genotypes suppress the function of this system in a manner which was inversely related to their heterochromatin content and total DNA content.Key words: Secale, Aegilops, chiasmata, meiotic pairing control, hybrids.

Synaptonemal Complex Analysis of Sex Chromosomes in Two Species of Sceloporus

Copeia ◽  
1990 ◽  
Vol 1990 (4) ◽  
pp. 1122 ◽  
Author(s):  
Kent M. Reed ◽  
Philip D. Sudman ◽  
Jack W. Sites ◽  
Ira F. Greenbaum
Keyword(s):  
Synaptonemal Complex ◽  
Sex Chromosomes ◽  
Complex Analysis ◽  
Synaptonemal Complex Analysis

Synaptonemal complex analysis of X-7 translocations in male mice

Chromosoma ◽  
1982 ◽  
Vol 87 (2) ◽  
pp. 149-164 ◽  
Author(s):  
Terry Ashley ◽  
Liane B. Russell ◽  
N. L. A. Cacheiro
Keyword(s):  
Synaptonemal Complex ◽  
Complex Analysis ◽  
Male Mice ◽  
Synaptonemal Complex Analysis
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